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And if you use electrostatic filters in the filter grille in each room you add the advantage of a more efficient filter system without the cost of overcomeing the static drop of a single filter at the unit. A little more maintenance, a lot cleaner return duct system, coil, supply duct system.

More filter are will reduce the PD of Electrostatic Filters for sure.This also reduces the fpm(velocity),thru the filter.I've been told that Electrostatics won't work as well at lower velocity as the velocity is part of creating the charge.

Has any one found anything about Dash's question on the velocity on Electrostatics? Makes sense that reducing the velocity would decrease the electrostatic charge, but in the right conditions (wrong depending upon the view point) how far and fast do you have to walk an Poly carpet to get shocked? I would love to see any studies if some finds one or more.